1. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Prism Venture Partners IV, L.P. ("PVP IV") on February 22, 2012.

2. Consists of securities held directly by PVP IV. Prism Investment Partners IV, L.P. ("PIP IV") is the sole general partner of PVP IV. Prism Venture Partners IV, LLC ("PVP IV LLC") is the sole general partner of PIP IV. Steven J. Benson ("Benson") is a member of PVP IV LLC. Benson may be deemed to beneficially own the shares held by PVP IV, but Benson disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

3. The price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was 24.66 to 25.02 per share. The reporting person undertakes to provide, upon request by the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

4. The price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was 23.59 to 24.48 per share. The reporting person undertakes to provide, upon request by the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

5. The price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was 24.63 to 25.02 per share. The reporting person undertakes to provide, upon request by the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

6. The price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was 23.28 to 24.22 per share. The reporting person undertakes to provide, upon request by the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

7. The price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was 24.29 to 24.51 per share. The reporting person undertakes to provide, upon request by the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

Remarks:

/s/ Laurier Beaupre as Attorney-in-Fact on behalf of Steven J. Benson, pursuant to a Power of Attorney attached hereto.

11/05/2012

** Signature of Reporting Person

Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person,
see
Instruction
4
(b)(v).